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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ef71fba46c4437a5c78cc04a67d7e60a9e3afdf9e56942f4fe0803066352a89' 
  AND token = '8ZaW1+iH4oK5xkAdcEPDORjnLzwlRKIDNWaePCZoFmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}